EP0669789B1 - Schaltungsanordnung zum Betrieb mindestens einer Niederdruckentladungslampe - Google Patents

Schaltungsanordnung zum Betrieb mindestens einer Niederdruckentladungslampe Download PDF

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Publication number
EP0669789B1
EP0669789B1 EP95101851A EP95101851A EP0669789B1 EP 0669789 B1 EP0669789 B1 EP 0669789B1 EP 95101851 A EP95101851 A EP 95101851A EP 95101851 A EP95101851 A EP 95101851A EP 0669789 B1 EP0669789 B1 EP 0669789B1
Authority
EP
European Patent Office
Prior art keywords
lamp
control unit
voltage
inverter
circuit arrangement
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP95101851A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0669789A1 (de
Inventor
Wolfram Dr. Sowa
Christoph Kreutner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Osram GmbH
Original Assignee
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Publication of EP0669789A1 publication Critical patent/EP0669789A1/de
Application granted granted Critical
Publication of EP0669789B1 publication Critical patent/EP0669789B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/36—Controlling
    • H05B41/38—Controlling the intensity of light
    • H05B41/39—Controlling the intensity of light continuously
    • H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
    • H05B41/3921—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations
    • H05B41/3927—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations by pulse width modulation
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/295—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps with preheating electrodes, e.g. for fluorescent lamps
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S315/00—Electric lamp and discharge devices: systems
    • Y10S315/04—Dimming circuit for fluorescent lamps

Definitions

  • the invention relates to a circuit arrangement for operating at least one low-pressure discharge lamp according to the preamble of claim 1.
  • a circuit arrangement corresponding to the preamble of claim 1 is described for example in the patent specification EP 0 059 064 B1.
  • This circuit arrangement has an externally controlled inverter, which has a series resonance circuit feeds a low-pressure discharge lamp with preheated electrode filaments.
  • the inverter supplies the lamp with a current whose frequency is wide lies above the resonance frequency of the series resonance circuit.
  • To ignite the Lamp becomes the switching frequency of the inverter towards the resonance frequency of the series resonance circuit shifted to the by means of resonance to generate the required ignition voltage.
  • the lamp is then operated by a Frequency that is slightly above the resonance frequency of the now through the lamp damped series resonance circuit.
  • the fluorescent lamp becomes the switching frequency of the inverter and thus the frequency of the lamp current depending on the setting on the dimmer increased again.
  • the reduced impedance of the parallel due to the frequency increase resonance capacitance switched to the discharge lamp causes a reduction in the Lamps stromes. In this way, the inverter switching frequency changes a brightness control of the low pressure discharge lamp.
  • German patent DE 33 38 464 C2 is a circuit arrangement with a self-oscillating Inverters for operating a dimmable fluorescent lamp disclosed, in which the brightness control of the fluorescent lamp by changing the Duty cycle of the high-frequency AC voltage generated by the inverter depending on the setting on the dimmer.
  • a circuit arrangement is also from the German utility model DE 89 15 386 U1 according to the preamble of claim 1 known for Dimming the fluorescent lamp a combination of frequency and Duty cycle change of the AC voltage generated by the inverter exploits.
  • the circuit arrangement disclosed here has also a half-bridge inverter via a series resonance circuit feeds a fluorescent lamp.
  • the brightness is controlled by the lamp like a phase control.
  • One arranged parallel to the lamp Bypass switch bridges the fluorescent lamp during an adjustable, depending on the setting on the dimmer, Phase angle of the lamp current.
  • the one flowing over the discharge path Current is thereby, according to the setting on the dimming device, weakened.
  • Matching the bypass switch to the Switching phases of the inverter requires a lot of circuitry.
  • the international patent application WO 93/07732 A1 describes a circuit arrangement for dimming gas discharge lamps with one Inverter. The lamps are dimmed by reducing the supply voltage at the DC voltage input of the inverter.
  • British patent application GB 2 212 995 A discloses an operating device for dimmable fluorescent lamps with a current regulator and one current regulator downstream inverter.
  • the brightness of the lamps is determined by a DC regulation by means of the current regulator and by pulse width modulation controlled by the inverter.
  • the circuit arrangement according to the invention essentially consists of an inverter with a downstream LC output circuit for power supply the low-pressure discharge lamp or low-pressure discharge lamps, a DC voltage supply unit for the inverter, a control unit and a dimming device with which the brightness of the lamp or lamps is adjusted becomes.
  • the dimming device and the control unit are in this way with the DC voltage supply unit interconnects that the control unit the supply voltage for the inverter to a value that is different from the selected setting depends on the dimmer.
  • the according to the setting on the Dimming device reduces the inverter supply voltage at a constant or approximately constant operating frequency of the inverter reduced lamps current, so that the low-pressure discharge lamp with reduced Performance burns.
  • the most preferred versions are a circuit arrangement for operating a fluorescent lamp, in particular for Dimming a fluorescent lamp.
  • the fluorescent lamp is powered by a half-bridge inverter with a downstream series resonance circuit into which the Lamp is integrated, powered.
  • the DC voltage supply of the half-bridge inverter takes over a preferably designed as an inverse or flyback converter DC voltage supply unit, whose DC voltage output with the input of the inverter is connected.
  • the switching transistor of the inverse or flyback converter receives from the control unit a control signal that the control unit the setpoint specified by the dimming device and that at the output capacitor the inverter supply voltage applied to the DC voltage supply unit as a controlled variable. This way the output voltage the DC voltage supply unit during lamp operation by the control unit and set the dimmer.
  • the electrode filaments of the fluorescent lamp are usually preheated.
  • the duration of the electrode preheating and also the level of the heating voltage must be independent of the preset lamp brightness. Therefore the control signal of the dimming device does not have any during the electrode preheating phase Influence on the control unit.
  • the transition from the electrode preheating phase to dimming takes place in the case of the invention Circuit arrangement advantageously by means of a timer, which triggers a relay at the end of the preheating phase, which switches the electrode coils to Ignition of the lamp bridged for a short time, and which also ensures that the Control unit the value for the lamp brightness set on the dimming device takes over. This ensures that the lamp is already immediate after starting with the brightness set via the dimming device burns.
  • the resonance capacitance arranged parallel to the discharge path from two capacitors connected in parallel. During the Preheating phase and also during lamp operation (after the lamp has been ignited) Both resonance capacitors are integrated in the series resonance circuit. During the Ignition phase, however, one of the two capacitors through the relay from the Series resonance circuit switched off.
  • the highly schematic Figure 1 illustrates the basic principle of the invention Circuit arrangement. It has a self-oscillating half-bridge inverter T1, T2 with a series resonance circuit for power supply a fluorescent lamp L.
  • the series resonant circuit contains a coupling capacitor CK, a resonance inductor LD, a resonance capacitance CR and the electrode filaments E1, E2 of the lamp L. All these components are connected in series, the Resonance capacitance CR between the two electrode coils E1, E2 in the Serial resonance circuit is integrated that they parallel to the discharge path of the lamp L is arranged.
  • the half-bridge inverter T1, T2 receives its supply voltage from the output capacitor C1 of a DC voltage supply unit.
  • the control of the half-bridge transistors T1, T2 is carried out by a control unit ST.
  • the working frequency of this half-bridge inverter is nearby the resonance frequency of the components CR, LR of its output circuit.
  • a dimmer D is via a control unit R with the output C1 of the DC voltage supply unit interconnected.
  • the Output capacitor C1 provided supply voltage for the inverter T1, T2 regulated depending on the setting on the dimmer.
  • a lower supply voltage for the half-bridge T1, T2 causes a lower one Current through the lamp L, which therefore burns with reduced power.
  • the series resonance circuit consisting of the resonance capacitor CR and the resonance inductance LR, relieved, so that the quality of the resonant circuit and so that the voltage at the resonance capacitor CR increases.
  • this increases the current through the capacitor CR and the current through the series switched electrode filaments E1, E2 of the lamp L.
  • Figure 2 shows the DC voltage supply unit operated with mains voltage the half-bridge inverter T1, T2 according to a first embodiment.
  • she consists of an inverse converter with an upstream rectifier G and a High-frequency filter F, which is a coupling of high-frequency interference signals into the Power grid prevented.
  • a description of a commonly used high frequency filter F can be found, for example, in the European patent application EP 0 541 909.
  • Parallel to the DC voltage output of the rectifier G is for Smoothing the rectified mains voltage, a smoothing capacitor C switched.
  • the inverse converter consists of a field effect transistor T, an inductor L, one Diode D and an electrolytic capacitor C1, which is parallel to the output of the inverse converter is switched.
  • the reference symbols V1, V2 and V3 define interfaces at which the invention Circuit arrangement has been separated for the sake of clarity. To the to obtain a complete circuit arrangement according to the first exemplary embodiment, the circuits of Figures 2 and 4 must be reassembled at these interfaces become.
  • the half-bridge inverter receives T1, T2 from the capacitor C1 via the interfaces V1, V2 its supply voltage and the timer ZS is via the interface V3 with a third input of the control unit R connected.
  • the inverter is a self-oscillating, current feedback Half-bridge inverter T1, T2 implemented.
  • the inverse converter builds on the electrolytic capacitor C1 the supply voltage for the half-bridge inverter T1, T2 on.
  • This supply voltage is initially independent of the setting on the dimmer and its value is selected so that during the electrode preheating phase the voltage generated by the half bridge T1, T2 at the center tap a sufficient current for electrode preheating through the series resonance circuit guaranteed.
  • this electrode preheating phase which lasts approx. 2 seconds, are the relay contacts K1, K2 open, so that the electrode coils E1, E2 in series are integrated in the series resonance circuit and by a high-frequency heating current be flowed through.
  • the resistance of the electrode coils E1, E2 dampens the series resonant circuit and prevents the lamp L from igniting at the end of the preheating phase the time switch ZS triggers the relay RE so that both relay contacts K1, K2 are closed briefly, for a period of approx. 8 ms, and activated at the same time the control unit R.
  • the electrode coils E1, E2 are bridged and the series resonance circuit undamped.
  • the ignition voltage builds up at the resonance capacitance CR for the fluorescent lamp L.
  • the relay contacts K1, K2 are open again.
  • the control unit R activated by the time switch ZS detects the am Output capacitor C1 applied supply voltage for the inverter T1, T2 and compares them with that supplied by the dimming device R.
  • the setting on the dimming device determined setpoint and controls their Connection to the gate electrode of the field effect transistor T the duty cycle of this Transistor T and thus regulates the output voltage of the inverse converter on the electrolytic capacitor C1.
  • a reduced output voltage of the inverse converter means a reduced supply voltage for the half-bridge inverter T1, T2.
  • the voltage drop at the center tap of the half-bridge inverter T1, T2 is then also reduced accordingly, so that through the series resonance circuit and over the discharge path of the lamp L flows a reduced current. In this way the power and the brightness of the fluorescent lamp L are controlled the inverter supply voltage depending on the setting on the Controlled dimmer.
  • FIGS. 6 and 7 illustrate the time course of the Control signals for the relay RE (curve 1 in each case) and for the control unit R (curve 2 in each case) during the transition from the electrode preheating phase to the normal one Lamp operation for two different dimmer settings.
  • the electrode preheating phase is the control signal for the control unit R (Fig. 6 and 7, curve 2) and thus also the control voltage for the gate electrode of the transistor T regardless of the setting on the dimming device D.
  • Das Relay RE receives no control signal and the switch contacts K1, K2 are open.
  • the control unit R is activated and the gate electrode of the transistor T receives different according to the dimmer settings Control signals.
  • the ignition phase lasts approx.
  • relay RE receives a control signal that closes both relay contacts K1, K2. After If the L lamp is ignited, both relay contacts are open again, the relay RE receives no control signal and the control voltage for the gate electrode of the transistor T is determined by the setting on the dimming device D and by the control unit R determined.
  • Figure 5 shows a second embodiment of the circuit arrangement according to the invention. At the interfaces V1, V2 and V3 it is with that shown in Figure 2 Inverse converter connected. It only differs from the first embodiment through the resonance capacity.
  • the resonance capacity is in the second embodiment executed in two parts. It consists of the resonance capacitors connected in parallel CR1 and CR2, both parallel to the discharge path of the Lamp are arranged. During the preheating phase and after the lamp has started Both resonance capacitors CR1, CR2 are integrated in the series resonance circuit (Position of the switch contacts K1, K2 as shown in Fig. 5).
  • the half-bridge inverter can be supplied with voltage T1, T2 also the flyback converter shown in Figure 3 can be used.
  • the flyback converter is via the high-frequency filter F and the rectifier G with the rectified and fed by the smoothing capacitor C 'mains voltage. It consists of a field effect transistor T ', a transformer TR, one Diode D 'and the electrolytic capacitor C1 connected in parallel with its output.
  • a description of the structure and operation of a flyback converter can be found For example, in the book "Clocked Power Supply" by J. Beckmann, Franzis-Verlag GmbH, pages 19-24 and will therefore not be explained in more detail here.
  • the control unit R and the dimming device D are, as in the first Described embodiment, with the gate electrode of the field effect transistor T ' and the output capacitor C1 of the flyback converter. Controls here too the control unit R on the duty cycle of the transistor T 'on the electrolytic capacitor C1 supply voltage for the half-bridge inverter T1, T2 depending on the selected setting on the dimmer.
  • the Regulation of the inverter voltage supply according to the setting on the Dimming device is also in this embodiment only at the beginning of Ignition phase activated by the timer ZS.
  • the reference symbols V1, V2 and V3 define interfaces via which the flyback converter shown in FIG. 3 with a of the circuits shown in Figure 4 or 5 according to the first or second embodiment connected is.
  • the dimming device D, the time switch ZS and the control unit R can be on can be realized in different ways.
  • the dimming device D produces at the entrance the control unit R a voltage between approx. 1 V (lowest dimming level) and 10 V (highest dimming level). In the simplest case, this can be done, for example, using a Dimming potentiometers can be reached.
  • a suitable time switch for example, is ZS an RC element with a downstream comparator. The time constant of this RC element essentially determines the duration of the electrode preheating phase.
  • the control unit R can be used, for example, as a PI or PID controller with an upstream subtractor will be realized.
  • the subtractor forms from the dimmer signal and for example from one to the supply voltage of the inverter proportional voltage signal is a differential voltage from which a signal for control the gate electrode of the transistor T, T 'of the DC voltage supply unit is derived.
  • the power of the lamp L can be dimmed down to 5% of their nominal value.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
  • Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
  • Inverter Devices (AREA)
EP95101851A 1994-02-24 1995-02-10 Schaltungsanordnung zum Betrieb mindestens einer Niederdruckentladungslampe Expired - Lifetime EP0669789B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4406083A DE4406083A1 (de) 1994-02-24 1994-02-24 Schaltungsanordnung zum Betrieb mindestens einer Niederdruckentladungslampe
DE4406083 1994-02-24

Publications (2)

Publication Number Publication Date
EP0669789A1 EP0669789A1 (de) 1995-08-30
EP0669789B1 true EP0669789B1 (de) 1999-09-29

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EP95101851A Expired - Lifetime EP0669789B1 (de) 1994-02-24 1995-02-10 Schaltungsanordnung zum Betrieb mindestens einer Niederdruckentladungslampe

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Country Link
US (1) US5493182A (ja)
EP (1) EP0669789B1 (ja)
JP (1) JP3771291B2 (ja)
DE (2) DE4406083A1 (ja)

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US5949197A (en) * 1997-06-30 1999-09-07 Everbrite, Inc. Apparatus and method for dimming a gas discharge lamp
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JP2982804B2 (ja) * 1998-01-16 1999-11-29 サンケン電気株式会社 放電灯点灯装置
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CN1304277A (zh) 1999-10-25 2001-07-18 俞志龙 一种适合调光用荧光灯电子镇流器
JP2002015892A (ja) * 2000-06-28 2002-01-18 Matsushita Electric Ind Co Ltd 放電ランプ点灯装置
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AU2002367201A1 (en) * 2001-12-25 2003-07-15 Matsushita Electric Works, Ltd. Discharge lamp operation apparatus
DE10204432A1 (de) * 2002-02-04 2003-09-11 Tridonicatco Gmbh & Co Kg Elektronisches Vorschaltgerät mit Wendelheizung
US6934168B2 (en) * 2003-02-27 2005-08-23 International Rectifier Corporation Single stage PFC and power converter unit
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US7336041B2 (en) * 2004-12-06 2008-02-26 Vicente Aldape Ayala Automatic light dimmer for electronic and magnetic ballasts (fluorescent or HID)
DE102005022592A1 (de) * 2005-05-17 2006-11-23 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Schaltungsanordnung zum Betrieb einer Entladungslampe mit schaltbarem Resonanzkondensator
JP2007026788A (ja) * 2005-07-14 2007-02-01 Osram-Melco Ltd 無電極放電ランプ照明装置
WO2007126737A2 (en) * 2006-04-03 2007-11-08 Ceelite Llc Constant brightness control for electro-luminescent lamp
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Also Published As

Publication number Publication date
DE4406083A1 (de) 1995-08-31
EP0669789A1 (de) 1995-08-30
DE59506923D1 (de) 1999-11-04
US5493182A (en) 1996-02-20
JPH07245189A (ja) 1995-09-19
JP3771291B2 (ja) 2006-04-26

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